新疆且末县布拉克铜矿地质特征及成因分析

新疆且末县布拉克铜矿位于吐拉盆地西南缘,为典型的陆相砂砾岩型铜矿床。矿体呈层状产出于白垩纪红色碎屑岩建造内的浅色砂砾岩层中。矿石由石英、长石等矿物晶屑、安山岩、玄武岩、流纹岩等岩石碎屑、孔雀石、褐铁矿等金属矿物填隙物及碳酸盐、泥质物等胶结物组成。吐拉断陷盆地西南缘白垩系砂砾岩层广泛分布,该矿床的发现与其成矿特征对该地区地质找矿具有指导意义。通过对矿床地质特征的总结及对控矿条件、物源等方面的研究,分析了矿床成因。综合研究认为,该铜矿形成经历了原生沉积-成岩期、成矿-表生氧化淋滤几个阶段,应属于沉积-成岩型陆相砂砾岩铜矿床。

Geological Characteristics and Genesis Analysis of the Bulake Copper Deposit in Qiemo,Xinjiang

The Bulake copper deposit in Qiemo,Xinjiang is located in the southwest edge of Tula Basin.It is a typical continental glutenite-type copper deposit.The ore body occurs as layered form in the light-colored glutenite beds in cretaceous red clastic rock formation;the ore is composed of mineral crystal fragments(quartz,feldspar,etc.),rock fragments(andesite,basalt,rhyolite,etc.),metallic interstitial materials(peacock rock,imonite,etc.),and cements(carbonate,mud,etc.).The cretaceous glutenite beds are widely distributed in the southwest margin of Tula Fault Basin.The discovery and study of the ore-forming characteristics of the deposit are of guiding significance to the geological prospecting in this area.Through the summary of the geological characteristics of the deposit and the study of ore-controlling conditions and source materials,we analyzed the genesis of the deposit in this paper.This comprehensive study indicates that this copper deposit forms sequentially across several stages of primary sedimentation,diagenetic mineralization,and supergene oxidation and leaching.And the deposit should be classified as sedimentary-diagenetic continental glutenite-type copper deposit.